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198 Commits

Author SHA1 Message Date
Chris Lattner 389d430c49 add a note 
llvm-svn: 43642
 2007-11-02 17:04:20 +00:00
Evan Cheng c826ac533b New entry. 
llvm-svn: 43420
 2007-10-28 04:01:09 +00:00
Evan Cheng 7f3d02471d Loosen up iv reuse to allow reuse of the same stride but a larger type when truncating from the larger type to smaller type is free. 
e.g.
Turns this loop:
LBB1_1: # entry.bb_crit_edge
        xorl    %ecx, %ecx
        xorw    %dx, %dx
        movw    %dx, %si
LBB1_2: # bb
        movl    L_X$non_lazy_ptr, %edi
        movw    %si, (%edi)
        movl    L_Y$non_lazy_ptr, %edi
        movw    %dx, (%edi)
		addw    $4, %dx
		incw    %si
		incl    %ecx
		cmpl    %eax, %ecx
		jne     LBB1_2  # bb
	
into

LBB1_1: # entry.bb_crit_edge
        xorl    %ecx, %ecx
        xorw    %dx, %dx
LBB1_2: # bb
        movl    L_X$non_lazy_ptr, %esi
        movw    %cx, (%esi)
        movl    L_Y$non_lazy_ptr, %esi
        movw    %dx, (%esi)
        addw    $4, %dx
		incl    %ecx
        cmpl    %eax, %ecx
        jne     LBB1_2  # bb

llvm-svn: 43375
 2007-10-26 01:56:11 +00:00
Arnold Schwaighofer 1f0da1fefb Corrected many typing errors. And removed 'nest' parameter handling 
for fastcc from X86CallingConv.td.  This means that nested functions
are not supported for calling convention 'fastcc'.

llvm-svn: 42934
 2007-10-12 21:30:57 +00:00
Evan Cheng 409fa443fc Update. 
llvm-svn: 42922
 2007-10-12 18:22:55 +00:00
Arnold Schwaighofer 9ccea99165 Added tail call optimization to the x86 back end. It can be 
enabled by passing -tailcallopt to llc.  The optimization is
performed if the following conditions are satisfied:
* caller/callee are fastcc
* elf/pic is disabled OR
  elf/pic enabled + callee is in module + callee has
  visibility protected or hidden

llvm-svn: 42870
 2007-10-11 19:40:01 +00:00
Dan Gohman 6d28778bfd This is done. 
llvm-svn: 42785
 2007-10-09 15:42:21 +00:00
Evan Cheng 42a13757de This is done. 
llvm-svn: 42656
 2007-10-05 22:34:59 +00:00
Chris Lattner 1f2b5f0e13 add a note. 
llvm-svn: 42607
 2007-10-04 15:47:27 +00:00
Chris Lattner 4bdb84fe53 add a note 
llvm-svn: 42579
 2007-10-03 17:10:03 +00:00
Chris Lattner 21ba176c4b Bill's example is still not enough to repro this, but it has other issues that 
seem significant as well.

llvm-svn: 42564
 2007-10-03 03:40:24 +00:00
Bill Wendling 3efc0758ae Another micro-opt. 
llvm-svn: 42554
 2007-10-02 21:49:31 +00:00
Bill Wendling f214ff8701 Another missed optimization with LICM. 
llvm-svn: 42552
 2007-10-02 21:43:06 +00:00
Bill Wendling 96ed3bb2d4 Now with LL code! 
llvm-svn: 42547
 2007-10-02 20:54:32 +00:00
Bill Wendling 9c4d61b523 Another missed optimization. 
llvm-svn: 42546
 2007-10-02 20:42:59 +00:00
Chris Lattner c9e7b8ec50 move PR1160 here. 
llvm-svn: 42347
 2007-09-26 06:29:31 +00:00
Evan Cheng 8c3c198499 New entry. 
llvm-svn: 41810
 2007-09-10 22:16:37 +00:00
Chris Lattner 6777b72659 Add some notes about better flag handling. 
llvm-svn: 41808
 2007-09-10 21:43:18 +00:00
Chris Lattner 33800d1428 add some notes on really poor codegen. 
llvm-svn: 41319
 2007-08-23 15:22:07 +00:00
Chris Lattner 78846b69ae add a note 
llvm-svn: 41178
 2007-08-20 02:14:33 +00:00
Chris Lattner 750b3dfcf5 expand a note 
llvm-svn: 41021
 2007-08-11 18:19:07 +00:00
Chris Lattner ee44ab5b5f With evan's explicit flag representation, hopefully we will finally be 
able to 3-addressify away stuff like this:

        movl    %ecx, %eax
        decl    %eax

llvm-svn: 41020
 2007-08-11 18:16:46 +00:00
Christopher Lamb 44e79f8aba Use subregs to improve any_extend code generation when feasible. 
llvm-svn: 41013
 2007-08-10 22:22:41 +00:00
Christopher Lamb b372abab14 Increase efficiency of sign_extend_inreg by using subregisters for truncation. As the README suggests sign_extend_subreg is selected to (sext(trunc)). 
llvm-svn: 41010
 2007-08-10 21:48:46 +00:00
Christopher Lamb f0c236fb8a Edit README in light of previous LEA16 commit. 
llvm-svn: 41009
 2007-08-10 21:29:05 +00:00
Chris Lattner 99fbf13dc3 add an observation 
llvm-svn: 40772
 2007-08-03 00:17:42 +00:00
Evan Cheng 7b5b06805a Only adjust esp around calls in presence of alloca. 
llvm-svn: 40028
 2007-07-19 00:42:05 +00:00
Evan Cheng f314055706 New entry. 
llvm-svn: 39998
 2007-07-18 08:21:49 +00:00
Evan Cheng 27ba94bf3b Update. 
llvm-svn: 39977
 2007-07-17 18:39:45 +00:00
Chris Lattner 7ea2df6e2a add a note 
llvm-svn: 37239
 2007-05-18 20:18:14 +00:00
Chris Lattner 623c738fe9 add some notes 
llvm-svn: 36965
 2007-05-10 00:08:04 +00:00
Chris Lattner be8f99ecbb move CodeGen/X86/overlap-add.ll here. 
llvm-svn: 36799
 2007-05-05 22:10:24 +00:00
Chris Lattner 62a8cbe594 SSE4 is apparently public now. 
llvm-svn: 36185
 2007-04-17 00:02:37 +00:00
Chris Lattner e275463e2f add a note 
llvm-svn: 36028
 2007-04-14 23:06:09 +00:00
Chris Lattner a6aa0319f1 done 
llvm-svn: 35884
 2007-04-11 05:34:00 +00:00
Chris Lattner d4a9b92a13 new micro optzn 
llvm-svn: 35867
 2007-04-10 21:14:01 +00:00
Chris Lattner f79fb5cad0 make a new missing features section 
llvm-svn: 35637
 2007-04-03 23:41:34 +00:00
Bill Wendling 2640b4a4ab Updated 
llvm-svn: 35634
 2007-04-03 23:37:20 +00:00
Chris Lattner 2ba38c8711 add a note 
llvm-svn: 35435
 2007-03-28 18:17:19 +00:00
Dale Johannesen a827d03154 add generation of unnecessary push/pop around calls 
llvm-svn: 35241
 2007-03-21 21:16:39 +00:00
Evan Cheng 71face25ef Notes about codegen issues. 
llvm-svn: 35107
 2007-03-14 21:03:53 +00:00
Chris Lattner fc2f52128a add a note 
llvm-svn: 34837
 2007-03-02 05:04:52 +00:00
Chris Lattner 44e9472fc6 more notes 
llvm-svn: 34204
 2007-02-12 21:20:26 +00:00
Chris Lattner b5c89c8d2d add a note 
llvm-svn: 34202
 2007-02-12 20:26:34 +00:00
Evan Cheng f76bb63555 This is done. 
llvm-svn: 34072
 2007-02-08 23:53:38 +00:00
Chris Lattner 71e123229c add a note 
llvm-svn: 33423
 2007-01-21 07:03:37 +00:00
Chris Lattner e76908ba81 add some notes 
llvm-svn: 33228
 2007-01-15 06:25:39 +00:00
Anton Korobeynikov a0554d90e8 * PIC codegen for X86/Linux has been implemented 
* PIC-aware internal structures in X86 Codegen have been refactored
* Visibility (default/weak) has been added
* Docs fixes (external weak linkage, visibility, formatting)

llvm-svn: 33136
 2007-01-12 19:20:47 +00:00
Chris Lattner af31398295 new note 
llvm-svn: 32945
 2007-01-06 01:30:45 +00:00
Chris Lattner f9cf05370f fix testcase. It's not safe to strictly evaluate a load that should be lazy. 
llvm-svn: 32842
 2007-01-03 19:12:31 +00:00